| 摘要 |
A mask function that replaces at least part of information, such as video data, audio data, and sub-picture data, with invalid data is provided in an information recording/reproducing apparatus. In one example application a personal computer (PC) and the information recording/reproducing apparatus are provided with an arrangement of features which encrypt the information at a sending end, the information is then exchanged between the sending end and a receiving end, and decrypted at the receiving end. Authentication is performed between the PC and the information recording/reproducing apparatus. If the authentication succeeds, then the information is transferred from one end where the information is encrypted to the other end where the information is decrypted. However if the authentication fails, the information recording/reproducing apparatus applies the mask function to the information when read from a storage medium or to the information to be written and transferred from the PC to the storage medium.
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